Introduction 1 Safety notes 2 SENTRON Description 3 Expansion module PAC RS485 Assembling 4 Parameter assignment/Addressing 5 Configuration 6 Service and maintenance 7 Alarm, error, and system messages 8 Troubleshooting/FAQs 9 Manual 02/2008 A5E02091800B-01 Technical data 10 Dimension drawings 11 Application examples 12 Appendix A ESD guidelines B List of abbreviations C
Safety Guidelines This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are graded according to the degree of danger. DANGER indicates that death or severe personal injury will result if proper precautions are not taken.
Table of contents 1 2 Introduction................................................................................................................................................ 7 1.1 Purpose of this document ..............................................................................................................7 1.2 Orientation aids ..............................................................................................................................7 1.3 Scope of supply ..............
Table of contents 5.1.9 5.1.10 5.1.11 5.1.12 5.1.13 6 7 8 9 Configuration ........................................................................................................................................... 57 6.1 Default settings ........................................................................................................................... 57 6.2 Changing the address .................................................................................................................
Table of contents Tables Table 1-1 Contacts in your region - worldwide...............................................................................................9 Table 1-2 Online service and support ............................................................................................................9 Table 1-3 Technical Support ........................................................................................................................
Table of contents Table 10-2 Mechanical data for the PAC RS485 expansion module............................................................ 68 Table 10-3 Electrical data for the PAC RS485 expansion module ............................................................... 69 Table 10-4 Ambient and environmental conditions ....................................................................................... 69 Table 10-5 Technical data for the communication interface ...................................
Introduction 1.1 1 Purpose of this document This manual is intended for: ● Planners ● Plant operators ● Commissioning engineers ● Service and maintenance personnel This manual contains: ● Details of the design of the PAC RS485 expansion module ● Permissible conditions of use for the PAC RS485 expansion module Required basic knowledge General knowledge in the fields of automation and electrical engineering is required to understand this manual. 1.
Introduction 1.3 Scope of supply 1.3 Scope of supply Description The package includes: ● The PAC RS485 expansion module including 2 permanent screws ● Terminal block including 6 permanent screws ● The operating instructions for the PAC RS485 expansion module 1.
Introduction 1.5 Technical support 1.5 Technical support Contact for technical problems and other questions Help is available from: ● Service and support contacts in your region - worldwide ● Online service and support ● Technical support Contacts in the region Contacts in your region can provide support worldwide. Table 1-1 Contacts in your region - worldwide Utility Address, number Internet: Service and support (http://www.siemens.
Introduction 1.6 Further documentation Table 1-3 Utility 1.6 Technical Support Address, number Phone: +49 (0)180-50-50-222 Fax: +49 (0)180-50-50-223 Internet: Support request (http://www.siemens.
2 Safety notes 2.1 Safety notes General safety notes DANGER Danger! High voltage Will cause death or serious injury. Turn off and lock out all power supplying this device before working on this device.
Safety notes 2.
3 Description 3.1 Area of application The PAC RS485 expansion module is designed for use with a SENTRON PAC Power Monitoring Device. Area of application of the PAC RS485 expansion module The PAC RS485 expansion module connects the SENTRON PAC Power Monitoring Device to the RS 485 bus. This integrates the SENTRON PAC Power Monitoring Device into power management systems and automation systems. The PAC RS485 expansion module communicates with the SENTRON PAC Power Monitoring Device and with the master.
Description 3.3 Tasks ● Configuration via: – the SENTRON PAC Power Monitoring Device – the Ethernet interface – the RS 485 interface ● Unicast messages ● Broadcast commands with address 0 to the MODBUS slaves See also Parameters and function codes supported by the broadcast commands (Page 55) 3.3 Tasks Description The tasks of the PAC RS485 expansion module are as follows: ● Provides measured values, parameters and settings of the SENTRON PAC Power Monitoring Device via the RS 485 bus.
Description 3.4 Structure 3.
Description 3.5 Firmware ཱ ི ཱི Figure 3-2 3.5 ི ཱ Schematic view of the rear of the PAC RS485 expansion module (1) Terminal block (2) Screw for mounting the PAC RS485 expansion module on the SENTRON PAC Power Monitoring Device (3) Guide pins; their guide for correct position ensures that the PAC RS485 expansion module is plugged into the SENTRON PAC Power Monitoring Device correctly (4) Pins Firmware General information The PAC RS485 expansion module does not have its own firmware.
Description 3.6 Bus and master 3.6 Bus and master Restrictions The following restrictions apply for the use of a bus and a master: ● You must use only broadcast commands that agree in syntax and meaning with the broadcast commands supported by the Power Monitoring Device. ● The following must be set on the bus and the master and on all nodes on the bus: – The same baud rate – The same communication settings, e.g.
Description 3.
4 Assembling 4.1 Procedure for installation and commissioning The following system configuration information must be available: ● Installation location of the device ● Baud rate ● Planned address of the PAC RS485 expansion module Procedure 1. Mount the SENTRON PAC Power Monitoring Device and the PAC RS485 expansion module. 2. Connect the SENTRON PAC Power Monitoring Device. 3. Connect the PAC RS485 expansion module to the RS 485 network. 4.
Assembling 4.2 Unpacking See also Safety notes (Page 11) Changing the address (Page 57) Examples of MODBUS communication (Page 75) Configuration of the PAC RS485 expansion module on the SENTRON PAC3200 Power Monitoring Device (Page 58) 4.2 Unpacking Observe the ESD Guidelines. Open the packaging with care. Do not use excessive force. Checks After receiving the module, and before installing it, you should make the following checks: ● Check the packaging for damage.
Assembling 4.3 Assembly 4.3 Assembly NOTICE Condensation Sudden fluctuations in temperature can lead to condensation. Condensation can affect the function of the PAC RS485 expansion module. Store the PAC RS485 expansion module in the operating room for at least 2 hours before commencing installation. Tools To install the PAC RS485 expansion module you will need the following tool: ● A cross-tip screwdriver PZ1, 0.5 Nm cal.
Assembling 4.3 Assembly [ + / 0 [ [ 61 % [ 1P Figure 4-1 Schematic view of assembling the PAC RS485 expansion module 1. Ensure safe isolation from supply. 2. Discharge yourself. 3. Mount the SENTRON PAC Power Monitoring Device. 4. Connect the current terminals and voltage terminals to the SENTRON PAC. 5. Handle the PAC RS485 expansion module by the plastic housing only. 6. Connect the PAC RS485 expansion module to the SENTRON PAC.
Assembling 4.4 Connecting NOTICE Damage due to moisture Moisture or wetness can affect the operating capability of the PAC RS485 expansion module. Make sure that no moisture or wetness can find its way into the PAC RS485 expansion module. Clean the PAC RS485 expansion module using a dry, lint-free cloth only. Do not operate the PAC RS485 expansion module in an environment affected by high humidity or wetness. Note the environmental requirements of the SENTRON PAC Power Monitoring Device.
Assembling 4.4 Connecting 0DVWHU ' 9 5 SXOO XS 38 % %DODQFHG 3DLU 7(5 7(5 $ SXOO GRZQ 3' &RPPRQ *URXQG ' 5 6ODYH Figure 4-2 ' 5 6ODYH Q Block diagram: General topology of the twisted-pair cable +/B B signal; D1 -/A A signal; D0 COM Common = Ground TER (Line) Termination = bus terminating resistor PU Pull-up resistor PD Pull-down resistor &RP % Figure 4-3 $ 7HU 38 3' Terminal assignment 1.
Assembling 4.4 Connecting &RP % Figure 4-4 $ 7HU 38 3' Terminal assignment with terminating resistor NOTICE Incorrect bus terminator If you switch more than two bus terminating resistors on one bus, this can result, for example, in signal reflections that interfere with communication on the bus. Never attach more than two bus terminators to one bus. Attach one bus terminating resistor at the start of the bus and one terminating resistor at the end of the bus. 5.
Assembling 4.5 Measures to be performed prior to start-up 4.5 Measures to be performed prior to start-up CAUTION Never start up damaged modules Damaged components can impair and endanger operation. Never use damaged components. NOTICE Condensation Store the device in the service room for at least two hours before applying voltage to the device for the first time. This will equalize the temperature and prevent the formation of condensation.
Assembling 4.6 Disassembly 4.6 Disassembly Disassembling 1. Ensure safe isolation from supply. 2. Observe the ESD Guidelines. Discharge yourself. Handle the PAC RS485 expansion module by the plastic housing only. 3. Remove the terminal block from the expansion module, or detach the cable from the terminal block. 4. Unscrew the PAC RS485 expansion module from the SENTRON PAC Power Monitoring Device. 5. Remove the PAC RS485 expansion module from the SENTRON PAC Power Monitoring Device. 6.
Assembling 4.
5 Parameter assignment/Addressing 5.1 MODBUS RTU 5.1.1 Structure of the job message frame Structure Data traffic between the master and the slave and between the slave and the master begins with the address of the slave. The job message frame consists of the following elements: 1. Address of the MODBUS slave 2. Function code 3. Data of the message frame 4. Checksum of the message frame (CRC) The structure of the data field depends on the function code used.
Parameter assignment/Addressing 5.1 MODBUS RTU Validity of the message frame Gaps in the message frame are filled with 0xFFFFFFFF. FFFFFFFF means the message frame contains no measured values. This means it is invalid. If the message frame has a different content it is in principle valid. See also Function codes (Page 31) 5.1.2 Character frame The MODBUS RTU specification defines the data format. The user can change the data format.
Parameter assignment/Addressing 5.1 MODBUS RTU The Least Significant Bit (LSB) is sent at the start of the eight data bits, and the Most Significant Bit (MSB) is sent at the end. See also Configuration of the PAC RS485 expansion module on the SENTRON PAC3200 Power Monitoring Device (Page 58) 5.1.3 Function codes Function codes control the data exchange. In doing so, a function code tells the slave which action it is to take. If an error occurs, the MSB bit is set in the response frame in the FC byte.
Parameter assignment/Addressing 5.1 MODBUS RTU FC 04 You can read out device registers with this function code. Number of requested registers: At least 1 to maximum 125 Corresponding exception codes: 01, 02, 03 or 04 Corresponding error code: 0x84 FC 06 This function code overwrites a slave register with a new value. Corresponding exception codes: 01, 02, 03 or 04 Corresponding error code: 0x86 FC 10 This function code writes a block of one to a maximum of 123 connected registers into the device.
Parameter assignment/Addressing 5.1 MODBUS RTU 5.1.4 Exception codes Overview Table 5-3 5.1.5 MODBUS exception codes Exception codes Name Meaning 01 Illegal Function Check which function Illegal function: codes are supported. • The function code in the request is not a permissible action for the slave. • The slave is in a status in which it cannot process a request of this type. This is the case, for example, if it has not yet been configured and is requested to return register values.
Parameter assignment/Addressing 5.1 MODBUS RTU NOTICE Error in the case of inconsistent access to measured values Please ensure the start offset of the register is correct when making read accesses. Please ensure the start offset and the number of registers are correct when making write accesses. If a value consists of two registers, a read command applied in the second register, for example, will generate an error code.
Parameter assignment/Addressing 5.
Parameter assignment/Addressing 5.1 MODBUS RTU Offset Number of Name registers Format Unit Value range Access 141 2 Max. Total Reactive Power Float var - R 143 2 Maximum Total Power Factor Float - R 145 2 Minimum Voltage Va-n Float V - R 147 2 Minimum Voltage Vb-n Float V - R 149 2 Minimum Voltage Vc-n Float V - R 151 2 Min. Voltage Va-b Float V - R 153 2 Min. Voltage Vb-c Float V - R 155 2 Min.
Parameter assignment/Addressing 5.
Parameter assignment/Addressing 5.1 MODBUS RTU 5.1.6 Structure 5.1.6.
Parameter assignment/Addressing 5.1 MODBUS RTU 5.1.6.
Parameter assignment/Addressing 5.
Parameter assignment/Addressing 5.1 MODBUS RTU Offset Number of registers Name Unit Format Value range Access 50019 2 Zero point suppression level (% rated current) % float 0.0 ... 10.0 RW 50021 2 Demand Period Min. unsigned long 1 ...
Parameter assignment/Addressing 5.1 MODBUS RTU Offset Number of registers Name Unit Format Value range Access 50037 2 "Limit violation" mode - unsigned long 0= Limit Logic RW 1= Limit 0 2= Limit 1 3= Limit 2 4= Limit 3 5= Limit 4 6= Limit 5 0= Import kWh 1= Export kWh 50041 2 "Energy pulse" mode - unsigned long 2= Import kvarh 3= Export kvarh RW 50043 2 Pulses per unit (pulses per 1000 Wh / VARh) - unsigned long 1 ...
Parameter assignment/Addressing 5.1 MODBUS RTU Table 5-13 Settings parameter for the display Offset Number of registers Name Unit Format Value range Access 50053 2 Refresh time ms unsigned long 330 ... 3000 RW 50055 2 Contrast - unsigned long 1 ... 10 RW 50057 2 Backlight level - Normal mode % unsigned long 0 ... 3 RW 50059 2 Backlight dimmed % unsigned long 0 ... 3 RW 50061 2 Backlight time until dimmed Min. unsigned long 0 ...
Parameter assignment/Addressing 5.
Parameter assignment/Addressing 5.
Parameter assignment/Addressing 5.
Parameter assignment/Addressing 5.1 MODBUS RTU Table 5-17 Settings parameter for limit value 3 Offset Number of registers Name Unit Format Value range Access 50105 2 ON/OFF - unsigned long 0= OFF RW 1= ON 50107 2 Hysteresis % float 0.0 ... 20.0 RW 50109 2 Delay s unsigned long 0 ...
Parameter assignment/Addressing 5.1 MODBUS RTU Offset Number of registers Name Unit Format Value range 33 = 50115 2 Value - float 50117 2 Modus ≥ / < - unsigned long Table 5-18 Access VAR_SUM 34 = PF_SUM 35 = V_BAL 36 = I_BAL - RW 0= greater than RW 1= less than Settings parameter for limit value 4 Offset Number of registers Name Unit Format Value range Access 50119 2 ON/OFF - unsigned long 0= OFF RW 1= ON 50121 2 Hysteresis % float 0.0 ... 20.
Parameter assignment/Addressing 5.
Parameter assignment/Addressing 5.
Parameter assignment/Addressing 5.1 MODBUS RTU 5.1.9 Modbus command parameters Addressing the command parameters You can use MODBUS function code 0x06 on the command parameters. Table 5-20 Command parameters Offset Number of registers Name Unit Format Value range from ...
Parameter assignment/Addressing 5.1 MODBUS RTU Offset Number of registers Name 60009 1 65300 1 Unit Format Value range from ... to Access Switching command for vector group unsigned short High 0 ... 99, Low 0 ... 1 High byte group assignment Low byte 1 = ON, 0 = OFF W Activation of a changed IP configuration/ Ethernet configuration unsigned short 0 W - 1) The MODBUS master must acknowledge these diagnostics bits.
Parameter assignment/Addressing 5.1 MODBUS RTU Offset Number of registers Name Unit Format Value range Applicable from ... to MODBUS function codes 63019 2 MODBUS address or Seabus address1) - unsigned long • • • 0x03 0x04 0x10 1 ...
Parameter assignment/Addressing 5.1 MODBUS RTU Table 5-22 I&M 0 parameter of the SENTRON PAC Power Monitoring Device with the function codes 0x03 and 0x04 Offset Total registers Number of registers per parameter Name Format Value range from ... to Access Start offset 64001 27 [1] Manufacturer's ID unsigned short 0 ... 65535 Standard: 42*) R [64002] [10] Order No. Char 20 ASCII R [64012] [8] Serial number Char 16 ASCII R [64020] [1] Hardware version unsigned short 0 ...
Parameter assignment/Addressing 5.1 MODBUS RTU See also Modbus measured variables with the function codes 0x03 and 0x04 (Page 33) 5.1.12 MODBUS standard device identification with the function code 0x2B Addressing the MODBUS standard device identification You can use MODBUS function code 0x2B on these device identification parameters.
Parameter assignment/Addressing 5.
6 Configuration 6.1 Default settings Factory default settings Table 6-1 Factory settings Parameter Value Address 126 Baud rate SENTRON PAC3200: 19200 baud Response time "0" = Auto Communication protocol MODBUS RTU Settings 8N2 Language The communication parameters are displayed in the language set on the SENTRON PAC Power Monitoring Device. Default setting: English See also Changing the address (Page 57) 6.
Configuration 6.3 Configuration of the PAC RS485 expansion module on the SENTRON PAC3200 Power Monitoring Device Setting a unique address Every device requires a unique address. The address is stored in the non-volatile memory of the SENTRON PAC Power Monitoring Device. Change the address of each device before you begin transferring data. You can change the address: ● Via the menu of the SENTRON PAC Power Monitoring Device ● Via the Ethernet interface, e.g.
Configuration 6.3 Configuration of the PAC RS485 expansion module on the SENTRON PAC3200 Power Monitoring Device Figure 6-1 Configuring the PAC RS485 expansion module using buttons "Address": Each expansion module has a unique address. You set this here. The addresses from 1 to 247 are supported. NOTICE Abnormal behavior of the bus with identical addresses If several expansion modules have the same address, this can result in abnormal behavior of the entire bus.
Configuration 6.3 Configuration of the PAC RS485 expansion module on the SENTRON PAC3200 Power Monitoring Device "Response time": If the Power Monitoring Device communicates over the RS 485 bus with an older MODBUS module from another manufacturer, it may be necessary to delay the response of a slave to a request from the master. The response time corresponds to the set baud rate. At baud rates ≥ 19200 bit/s, the response time corresponds to a character interval of at least 3.
Service and maintenance 7.1 7 Cleaning Description The PAC RS485 expansion module is maintenance-free. CAUTION Damage due to detergents Detergents can damage the device. Do not use detergents. NOTICE Defective connector Ensure that the pins of the connector between the expansion module and the SENTRON PAC Power Monitoring Device do not deform. Bent pins can destroy the connector. 1. Use only a dry, lint-free, antistatic cloth to clean the housing. 2. Clean the pins carefully using a brush.
Service and maintenance 7.2 Repair 7.2 Repair Procedure NOTICE Loss of certification and warranty If you open the module, the module certification will be lost and the Siemens warranty will be invalidated. Only the manufacturer is permitted to carry out repairs on the module. Return faulty or damaged modules to Siemens for repair or replacement. If the module is faulty or damaged, proceed as follows: 1. Discharge yourself. 2. Remove the module. 3.
Alarm, error, and system messages 8.
Alarm, error, and system messages 8.2 Diagnostics LED 8.2 Diagnostics LED Significance of the diagnostics LED The diagnostics LED indicates the communication status. Table 8-1 Fault and status indication by the LED Color Status Description Measure Green and yellow Off No voltage applied to the PAC RS485 expansion module 1. Check that the PAC RS485 expansion module is correctly connected to the SENTRON PAC Power Monitoring Device. 2.
Troubleshooting/FAQs 9.1 9 Power failure Settings The settings of the PAC RS485 expansion module are not lost in the event of a power failure. They are saved in the SENTRON PAC Power Monitoring Device.
Troubleshooting/FAQs 9.
10 Technical data 10.1 Cable Requirements Use a serial, shielded, 3-core interface cable: ● Two twisted cores are required for the signals -A and +B ● The third core is required for the Common signal. The maximum length of the bus cable depends on the following: ● The baud rate ● The properties of the cable used: – Thickness – Capacitance – Characteristic surge impedance ● Number of stations ● The network configuration, e.g.
Technical data 10.3 Technical data Note Other standards In addition to the above-mentioned standards, those listed in the manual of the SENTRON PAC Power Monitoring Device also apply. 10.
Technical data 10.
Technical data 10.4 Communication interface 10.4 Communication interface Technical data Table 10-5 Technical data for the communication interface Values Electrical interface RS 485, twisted-pair cable + 1 cable for Common Connection type Terminal block with screw terminals RS 485 data transfer: supported baud rates in bps 4800 /9600 / 19200 / 38400 / 57600 / 115200 Standard: 19200 The following is supported in conjunction with the SENTRON PAC3200: max.
Technical data 10.5 Labeling Table 10-7 Technical data of the terminal block Values H1L screws 10.5 M3x4.9 Labeling Description The graphic below shows the positioning of the label on the housing of the PAC RS485 expansion module. s 3$& 56 .
Technical data 10.
11 Dimension drawings 11.1 Dimension drawings s 3$& 56 .
Dimension drawings 11.
12 Application examples 12.1 Examples of MODBUS communication General information The master makes a request to the slave, the SENTRON PAC Power Monitoring Device. This replies to the master and confirms that it has executed the request. Below is a representation of communication between the master and the slave using some application examples from the "Application Log-File" of the bus master. The values are specified in hexadecimal form.
Application examples 12.
Application examples 12.
Application examples 12.
A Appendix A.1 Correction sheet Correction sheet Have you noticed any errors while reading this manual? If so, please use this form to tell us about them. We welcome comments and suggestions for improvement.
Appendix A.1 Correction sheet Fax response From (please complete): To Name SIEMENS AG A&D CD MM3 Company/Department P.O.
ESD guidelines B.1 B Electrostatic sensitive devices (ESD) ESD components are destroyed by voltage and energy far below the limits of human perception. Voltages of this kind occur as soon as a device or an assembly is touched by a person who is not electrostatically discharged. ESD components which have been subject to such voltage are usually not recognized immediately as being defective, because the malfunction does not occur until after a longer period of operation.
ESD guidelines B.
C List of abbreviations C.1 Abbreviations Overview Table C-1 Meaning of abbreviations Abbreviation Meaning ANSI American National Standards Institute Old: CCITT New: ITU-T Old: Comité Consultatif International Télégraphique et Téléphonique (English: International Consultative Committee for Telegraphy and Telephony); New: Telecommunication Standardization Sector AWG American Wire Gauge CD Compact Disk CRC Cyclic redundancy check DIN Deutsches Institut für Normierung e. V.
List of abbreviations C.
Glossary American Wire Gauge American Wire Gauge is a number assigned to a specific conductor or wire cross-section. Each AWG number represents a jump of 26% in the cross-sectional area. The thicker the wire, the smaller the AWG number. A copper wire with AWG 10 has a diameter of 2.54 mm, a cross-sectional area of 5 mm² and a resistance of 1 Ohm over a length of 304.8 m. With a reduction of 3 AWG, e.g. AWG 10 to AWG 7, the cross-sectional area and the mass (weight) are doubled. The DC resistance is halved.
Glossary Function code The function code defines the meaning of the message frame. The function code defines the structure of the message frame. Half-duplex mode Bidirectional data traffic. Data is exchanged between the communication partners but only in one direction at a time. In half-duplex mode, the driver switches the twisted-pair cable R(A),R(B) of the interface between send mode and receive mode. Individual data flow control characters (e.g. XON/XOFF) can be an exception to this.
Glossary Unicast In unicast frames, the master sends a request to a certain slave.
Glossary 88 PAC RS485 Manual, 02/2008, A5E02091800B-01
Index A A signal, 24 Address, 19, 57, 58, 59, 70 Change, 58 Address change, 58 Address range Supported, 70 Ambient conditions, 69 ANSI TIA/EIA 485 A protective circuit, 69 Apply the supply voltage, 19 Area of application, 13 Assembly, 19, 21 Avoid condensation, 21 AWG, 70 B B signal, 24 Basic Device Identification, 32 Baud rate, 19, 57, 59, 67, 70 Supported, 70 Bit mask, 38 Broadcast, 70 Broadcast commands, 14, 17, 55 Data conflict, 55 Parameters, 55 Bus, 19 Bus cable Length, 67 Bus connector, 25 Bus cycle
Index Device status, 38 Diagnostics, 64 Diagnostics options, 63 Dimensions of housing, 68 Disassembly, 27 Discharge, 22, 62, 81 Disposal, 62 E Electrical data, 69 Electrical isolation, 69 Electrostatic sensitive devices, 81 End of message frame, 29 Endangering of operation, 26 Environmental conditions, 69 Error code, 31, 34, 53, 63 Error display, 64 ESD bracelet, 82 ESD footwear, 82 ESD Guidelines, 20, 21, 27, 81 ESD protective measures, 81 ESD seat, 82 ESD smock, 82 ESD standing position, 82 ESD table, 8
Index Network configuration, 67 Non-volatile memory, 68 O Object ID, 55 Offset, 33, 34, 38, 39, 40, 41, 42, 43, 44, 45, 47, 48, 49, 51, 52, 56 Online support, 9 Orientation aids, 7 Overall depth, 68 P Packaging, 20 Parameter Command, 51 Communication, 52 Device information, 55 Status, 39 Parameterize, 19 Parameters Settings parameters, 40 Parity bit, 59 Perform checks, 20 Performance calculation, 60 Permissible degree of pollution, 69 Pin, 16, 21, 61 Positive signal, 25 Power failure, 65 Power supply, 68
Index Type plate, 71 U Unicast, 70 Unicast messages, 14 Unpacking, 20 Use of a bus and master Restrictions, 17 V Ventilation slots, 15, 21, 26, 68 Voltage terminals, 22 W Weight, 68 Wetness, 23 92 PAC RS485 Manual, 02/2008, A5E02091800B-01
